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Effect of hydrogen peroxide and cross-protection. L. plantarum NZ1807(pNZ8154) grown at either 30°C or 42°C was incubated with hydrogen peroxide (0 to 6 mM, 30 min at 30°C), after which the mutation frequency (A) and viability (B) were determined. The positive effects of adaptation to 42°C (cross-protection) on the mutation frequency (A) and viability (B) when cells were exposed to high levels of hydrogen peroxide are shown.
